stoichiomtry-mass of a product reaction.?

Question

what steps would you take to do these?

What mass of carbon momoxide must react with oxygen to produce .69grams of carbon dioxide?


How many grams of ozone (O3) must decompose to produse .87 grams of oxygen?

Answer 1

1st, write balanced reaction:

2CO + O2 -> 2CO2

2nd, change 0.69 g CO2 to moles

0.69 g CO2 / (44.01 g CO2 per 1 mol CO2) = 0.0157 mol CO2

3rd, find mol CO required by mole ratio. Since it is a 2 to 2 ratio,we need 0.0157 mol CO.

4th, change 0.0157 mol CO to grams

0.0157 mol CO * (28.01 g CO per 1 mol CO) = 0.440 g CO.

so answer is 0.440 g of CO.
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same procedure with other one.